addressBookHelper.h
#import <Foundation/Foundation.h>

enum {
    ABHelperCanNotConncetToAddressBook,
    ABHelperExistSpecificContact,
    ABHelperNotExistSpecificContact
};

typedef NSUInteger ABHelperCheckExistResultType;

@interface addressBookHelper : NSObject

// 添加联系人
// name 　　　　-> 联系人姓名
// phoneNum    -> 电话号码
// label　　　　-> 电话号码的标签备注
+ (BOOL)addContactName:(NSString*)name phoneNum:(NSString*)num withLabel:(NSString*)label;

// 查询指定号码是否已存在于通讯录
// 返回值：
//　　ABHelperCanNotConncetToAddressBook -> 连接通讯录失败（iOS6之后访问通讯录需要用户许可）
//　　ABHelperExistSpecificContact　　　　-> 号码已存在
//　　ABHelperNotExistSpecificContact　　-> 号码不存在
+ (ABHelperCheckExistResultType)existPhone:(NSString*)phoneNum;

@end


addressBookHelper.m
#import "addressBookHelper.h"
#import <AddressBook/AddressBook.h>

@implementation addressBookHelper

// 单列模式
+ (addressBookHelper*)shareControl
{
    static addressBookHelper *instance;
    @synchronized(self) {
        if(!instance) {
            instance = [[addressBookHelper alloc] init];
        }
    }
    return instance;
}

+ (BOOL)addContactName:(NSString *)name phoneNum:(NSString *)num withLabel:(NSString *)label
{
    return [[addressBookHelper shareControl] addContactName:name phoneNum:num withLabel:label];
}

// 添加联系人（联系人名称、号码、号码备注标签）
- (BOOL)addContactName:(NSString*)name phoneNum:(NSString*)num withLabel:(NSString*)label
{
    // 创建一条空的联系人
    ABRecordRef record = ABPersonCreate();
    CFErrorRef error;
    // 设置联系人的名字
    ABRecordSetValue(record, kABPersonFirstNameProperty, (__bridge CFTypeRef)name, &error);
    // 添加联系人电话号码以及该号码对应的标签名
    ABMutableMultiValueRef multi = ABMultiValueCreateMutable(kABPersonPhoneProperty);
    ABMultiValueAddValueAndLabel(multi, (__bridge CFTypeRef)num, (__bridge CFTypeRef)label, NULL);
    ABRecordSetValue(record, kABPersonPhoneProperty, multi, &error);
    
    ABAddressBookRef addressBook = nil;
    // 如果为iOS6以上系统，需要等待用户确认是否允许访问通讯录。
    if ([[UIDevice currentDevice].systemVersion floatValue] >= 6.0)
    {
        addressBook = ABAddressBookCreateWithOptions(NULL, NULL);
        //等待同意后向下执行
        dispatch_semaphore_t sema = dispatch_semaphore_create(0);
        ABAddressBookRequestAccessWithCompletion(addressBook, ^(bool granted, CFErrorRef error)
                                                 {
                                                     dispatch_semaphore_signal(sema);
                                                 });
        dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
//        dispatch_release(sema);
    }
    else
    {
//        addressBook = ABAddressBookCreate();
        addressBook = ABAddressBookCreateWithOptions(NULL, (CFErrorRef *)&error);
    }
    
    // 将新建联系人记录添加如通讯录中
    BOOL success = ABAddressBookAddRecord(addressBook, record, &error);
    if (!success) {
        return NO;
    }else{
        
        // 如果添加记录成功，保存更新到通讯录数据库中
        success = ABAddressBookSave(addressBook, &error);
        return success ? YES : NO;
    }
}

+ (ABHelperCheckExistResultType)existPhone:(NSString *)phoneNum
{
    return [[addressBookHelper shareControl] existPhone:phoneNum];
}

// 指定号码是否已经存在
- (ABHelperCheckExistResultType)existPhone:(NSString*)phoneNum
{
    ABAddressBookRef addressBook = nil;
     CFErrorRef error;
    if ([[UIDevice currentDevice].systemVersion floatValue] >= 6.0)
    {
        addressBook = ABAddressBookCreateWithOptions(NULL, NULL);
        //等待同意后向下执行
        dispatch_semaphore_t sema = dispatch_semaphore_create(0);
        ABAddressBookRequestAccessWithCompletion(addressBook, ^(bool granted, CFErrorRef error)
                                                 {
                                                     dispatch_semaphore_signal(sema);
                                                 });
        dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
//        dispatch_release(sema);
    }
    else
    {
//        addressBook = ABAddressBookCreate();
        addressBook = ABAddressBookCreateWithOptions(NULL, (CFErrorRef *)&error);
    }
    CFArrayRef records;
    if (addressBook) {
        // 获取通讯录中全部联系人
        records = ABAddressBookCopyArrayOfAllPeople(addressBook);
    }else{
#ifdef DEBUG
        NSLog(@"can not connect to address book");
#endif
        return ABHelperCanNotConncetToAddressBook;
    }
    
    // 遍历全部联系人，检查是否存在指定号码
    for (int i=0; i<CFArrayGetCount(records); i++) {
        ABRecordRef record = CFArrayGetValueAtIndex(records, i);
        CFTypeRef items = ABRecordCopyValue(record, kABPersonPhoneProperty);
        CFArrayRef phoneNums = ABMultiValueCopyArrayOfAllValues(items);
        if (phoneNums) {
            for (int j=0; j<CFArrayGetCount(phoneNums); j++) {
                NSString *phone = (NSString*)CFArrayGetValueAtIndex(phoneNums, j);
                if ([phone isEqualToString:phoneNum]) {
                    return ABHelperExistSpecificContact;
                }
            }
        }
    }
    
    CFRelease(addressBook);
    return ABHelperNotExistSpecificContact;
}


使用
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    NSString *phone = @"222222341";
    
    if ([addressBookHelper existPhone:phone] == ABHelperExistSpecificContact)
    {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"消息提示" message:[NSString stringWithFormat:@"手机号码：%@已存在通讯录",phone] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
    }
    else
    {
        if ([addressBookHelper addContactName:@"刘德华" phoneNum:phone withLabel:@"测试"])
        {
            UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"消息提示" message:@"添加到通讯录成功" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alert show];
        };
    }
}